import java.util.Scanner;
  public class Example2_3 {
    public static void main (String args []) {
      System.out.println("请输入若干个数，每输入一个数回车确认");
      System.out.println("最后输入数字0结束操作");
      Scanner reader = new Scanner(System.in);
      double sum =0;
      double x = reader.nextDouble();
      while(x!=0){
        sum =sum+x;
        x=reader.nextDouble();
      }
      System.out.println("sum = "+sum);
   } 
}
